Curious to know what field you
are going into?
To the OP:
1. If this fatigue is going to mean that you can't take call or stand in the OR for long cases be prepared to deal with resentment from your colleagues. Not trying to be discouraging, just stating a fact. The culture of medicine (and especially the culture of surgery) is surprisingly intolerant of medical conditions among its own.
I'm going into pediatrics.
Not a lot of my classmates know i have a chronic illness, and I never mentioned it to faculty if I didn't have to. Yea, I have fatigue (I have a rheumatologic disorder) and I deal with it and am really good at planning my time so that I got enough sleep (even on surgery, etc). I'm graduating AOA and matched at my first choice residency program - so it is definitely doable, you just have to make some sacrifices here and there about what you do outside of med school.
To the OP: What I did to prepare for getting sick - I told the medical affairs dean (just in case); sometimes I had to tell faculty - for example, when i got exposed to meningococcemia and i'm significantly immunosuppressed; I had a great, supportive rheumatologist who'd work me in when I needed to be seen and take my word for it when I was going into a flare.
Not sure if i'm addressing anybody's questions - I think my point is - I'd do it again even though it was tough. and I think my experiences will make me a more understanding doctor. And when I got really sick, I occasionally missed lecture/rotations. But I toughed it out a lot, so i only took time off when I really needed to.